However, Mr Archibald said: “With this one I have to say we are really struggling to find a motive for why somebody might attack the sports clubs, causing damage. We genuinely don’t know at this stage.”

Dozens of officers have been brought into the area and a behavioural scientist from the National Crime Agency has been consulted.

Marked cars are patrolling sports premises - of which there are more than 130 in Reigate & Banstead borough.

Due to Oakwood Sports Centre’s position adjacent to Oakwood School, police have now contacted all schools in the area which are breaking up for the summer.

Andrew Rundle, the neighbourhood commander for Reigate and Banstead, said: “As soon as we had confirmation that the fire was a crime rather than unfortunate circumstances, we sent messages out to all the schools in the Reigate and Banstead area suggesting they take up an arson prevention visit.

“The local team are also incorporating those schools into their daily patrols.

“[We have said to the officers] if you are in the area, have got downtime and are not being sent to a job - please, please bear in mind vulnerable locations like schools and sports clubs.”

Anyone with any information on the incidents is asked to call 101 quoting reference P14210504.

Crimestoppers can be contacted anonymously on 0800 555 111 and a £2,000 reward has been offered for any information passed to them which leads to the arrest and charge of an offender.